Switch ANSI rendering to termenv to automatically convert colors between color-profiles

ansi/baseelement.go

@@ -2,15 +2,10 @@ package ansi
 
 import (
 	"bytes"
-	"errors"
-	"fmt"
 	"io"
-	"os"
-	"strconv"
 	"text/template"
 
-	"github.com/logrusorgru/aurora"
-	"github.com/lucasb-eyer/go-colorful"
+	"github.com/muesli/termenv"
 )
 
 // BaseElement renders a styled primitive element.
@@ -21,50 +16,6 @@ type BaseElement struct {
 	Style  StylePrimitive
 }
 
-func color(c *string) (uint8, error) {
-	if c == nil || len(*c) == 0 {
-		return 0, errors.New("invalid color")
-	}
-	if (*c)[0] == '#' {
-		i, err := hexToANSIColor(*c)
-		return uint8(i), err
-	}
-	i, err := strconv.Atoi(*c)
-	return uint8(i), err
-}
-
-func colorSeq(fg *string, bg *string) (string, error) {
-	fc := ""
-	bc := ""
-	if fg != nil {
-		fc = *fg
-	}
-	if bg != nil {
-		bc = *bg
-	}
-
-	fs := ""
-	bs := ""
-	f, err := colorful.Hex(fc)
-	if err == nil {
-		fs = fmt.Sprintf("38;2;%d;%d;%d", uint8(f.R*255), uint8(f.G*255), uint8(f.B*255))
-	}
-	b, err := colorful.Hex(bc)
-	if err == nil {
-		bs = fmt.Sprintf("48;2;%d;%d;%d", uint8(b.R*255), uint8(b.G*255), uint8(b.B*255))
-	}
-
-	if len(fs) > 0 || len(bs) > 0 {
-		seq := "\x1b[" + fs
-		if len(fs) > 0 {
-			seq += ";"
-		}
-		return seq + bs + "m", nil
-	}
-
-	return "", errors.New("invalid color")
-}
-
 func formatToken(format string, token string) (string, error) {
 	var b bytes.Buffer
 
@@ -85,33 +36,16 @@ func renderText(w io.Writer, rules StylePrimitive, s string) {
 		return
 	}
 
-	truecolor := os.Getenv("COLORTERM") == "truecolor"
-	// FIXME: ugly true-color ANSI support hack
-	if truecolor {
-		seq, err := colorSeq(rules.Color, rules.BackgroundColor)
-		if err == nil {
-			s = seq + s
-		} else {
-			truecolor = false
-		}
-	}
+	p := termenv.SupportedColorProfile()
+	out := termenv.String(s)
 
-	out := aurora.Reset(s)
-
-	if !truecolor {
 	if rules.Color != nil {
-			i, err := color(rules.Color)
-			if err == nil {
-				out = out.Index(i)
-			}
+		out = out.Foreground(p.Color(*rules.Color))
 	}
 	if rules.BackgroundColor != nil {
-			i, err := color(rules.BackgroundColor)
-			if err == nil {
-				out = out.BgIndex(i)
-			}
-		}
+		out = out.Background(p.Color(*rules.BackgroundColor))
 	}
+
 	if rules.Underline != nil && *rules.Underline {
 		out = out.Underline()
 	}
@@ -122,10 +56,10 @@ func renderText(w io.Writer, rules StylePrimitive, s string) {
 		out = out.Italic()
 	}
 	if rules.CrossedOut != nil && *rules.CrossedOut {
-		out = out.CrossedOut()
+		out = out.CrossOut()
 	}
 	if rules.Overlined != nil && *rules.Overlined {
-		out = out.Overlined()
+		out = out.Overline()
 	}
 	if rules.Inverse != nil && *rules.Inverse {
 		out = out.Reverse()

ansi/style.go

@@ -1,9 +1,5 @@
 package ansi
 
-import (
-	"github.com/lucasb-eyer/go-colorful"
-)
-
 // Chroma holds all the chroma settings.
 type Chroma struct {
 	Text                StylePrimitive `json:"text,omitempty"`
@@ -229,53 +225,3 @@ func cascadeStyle(parent StyleBlock, child StyleBlock, toBlock bool) StyleBlock
 
 	return s
 }
-
-func hexToANSIColor(h string) (int, error) {
-	c, err := colorful.Hex(h)
-	if err != nil {
-		return 0, err
-	}
-
-	v2ci := func(v float64) int {
-		if v < 48 {
-			return 0
-		}
-		if v < 115 {
-			return 1
-		}
-		return int((v - 35) / 40)
-	}
-
-	// Calculate the nearest 0-based color index at 16..231
-	r := v2ci(c.R * 255.0) // 0..5 each
-	g := v2ci(c.G * 255.0)
-	b := v2ci(c.B * 255.0)
-	ci := 36*r + 6*g + b /* 0..215 */
-
-	// Calculate the represented colors back from the index
-	i2cv := [6]int{0, 0x5f, 0x87, 0xaf, 0xd7, 0xff}
-	cr := i2cv[r] // r/g/b, 0..255 each
-	cg := i2cv[g]
-	cb := i2cv[b]
-
-	// Calculate the nearest 0-based gray index at 232..255
-	var grayIdx int
-	average := (r + g + b) / 3
-	if average > 238 {
-		grayIdx = 23
-	} else {
-		grayIdx = (average - 3) / 10 // 0..23
-	}
-	gv := 8 + 10*grayIdx // same value for r/g/b, 0..255
-
-	// Return the one which is nearer to the original input rgb value
-	c2 := colorful.Color{R: float64(cr) / 255.0, G: float64(cg) / 255.0, B: float64(cb) / 255.0}
-	g2 := colorful.Color{R: float64(gv) / 255.0, G: float64(gv) / 255.0, B: float64(gv) / 255.0}
-	colorDist := c.DistanceLab(c2)
-	grayDist := c.DistanceLab(g2)
-
-	if colorDist <= grayDist {
-		return 16 + ci, nil
-	}
-	return 232 + grayIdx, nil
-}

go.mod

@@ -4,10 +4,9 @@ go 1.13
 
 require (
 	github.com/alecthomas/chroma v0.7.0
-	github.com/logrusorgru/aurora v0.0.0-20191116043053-66b7ad493a23
-	github.com/lucasb-eyer/go-colorful v1.0.3
 	github.com/microcosm-cc/bluemonday v1.0.2
 	github.com/muesli/reflow v0.0.0-20191216070243-e5efeac4e302
+	github.com/muesli/termenv v0.0.0-20200113033546-8f8d5d08dedf
 	github.com/olekukonko/tablewriter v0.0.4
 	github.com/yuin/goldmark v1.1.19
 )

go.sum

@@ -20,14 +20,14 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/dlclark/regexp2 v1.1.6 h1:CqB4MjHw0MFCDj+PHHjiESmHX+N7t0tJzKvC6M97BRg=
 github.com/dlclark/regexp2 v1.1.6/go.mod h1:2pZnwuY/m+8K6iRw6wQdMtk+rH5tNGR1i55kozfMjCc=
+github.com/google/goterm v0.0.0-20190703233501-fc88cf888a3f h1:5CjVwnuUcp5adK4gmY6i72gpVFVnZDP2h5TmPScB6u4=
+github.com/google/goterm v0.0.0-20190703233501-fc88cf888a3f/go.mod h1:nOFQdrUlIlx6M6ODdSpBj1NVA+VgLC6kmw60mkw34H4=
 github.com/gorilla/csrf v1.6.0/go.mod h1:7tSf8kmjNYr7IWDCYhd3U8Ck34iQ/Yw5CJu7bAkHEGI=
 github.com/gorilla/handlers v1.4.1/go.mod h1:Qkdc/uu4tH4g6mTK6auzZ766c4CA0Ng8+o/OAirnOIQ=
 github.com/gorilla/mux v1.7.3/go.mod h1:1lud6UwP+6orDFRuTfBEV8e9/aOM/c4fVVCaMa2zaAs=
 github.com/gorilla/securecookie v1.1.1/go.mod h1:ra0sb63/xPlUeL+yeDciTfxMRAA+MP+HVt/4epWDjd4=
 github.com/hashicorp/hcl v1.0.0/go.mod h1:E5yfLk+7swimpb2L/Alb/PJmXilQ/rhwaUYs4T20WEQ=
 github.com/jessevdk/go-flags v1.4.0/go.mod h1:4FA24M0QyGHXBuZZK/XkWh8h0e1EYbRYJSGM75WSRxI=
-github.com/logrusorgru/aurora v0.0.0-20191116043053-66b7ad493a23 h1:Wp7NjqGKGN9te9N/rvXYRhlVcrulGdxnz8zadXWs7fc=
-github.com/logrusorgru/aurora v0.0.0-20191116043053-66b7ad493a23/go.mod h1:7rIyQOR62GCctdiQpZ/zOJlFyk6y+94wXzv6RNZgaR4=
 github.com/lucasb-eyer/go-colorful v1.0.3 h1:QIbQXiugsb+q10B+MI+7DI1oQLdmnep86tWFlaaUAac=
 github.com/lucasb-eyer/go-colorful v1.0.3/go.mod h1:R4dSotOR9KMtayYi1e77YzuveK+i7ruzyGqttikkLy0=
 github.com/mattn/go-colorable v0.0.9/go.mod h1:9vuHe8Xs5qXnSaW/c/ABM9alt+Vo+STaOChaDxuIBZU=
@@ -40,6 +40,8 @@ github.com/microcosm-cc/bluemonday v1.0.2/go.mod h1:iVP4YcDBq+n/5fb23BhYFvIMq/le
 github.com/mitchellh/mapstructure v1.1.2/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh9fWfEaFds41c1Y=
 github.com/muesli/reflow v0.0.0-20191216070243-e5efeac4e302 h1:jOh3Kh03uOFkRPV3PI4Am5tqACv2aELgbPgr7YgNX00=
 github.com/muesli/reflow v0.0.0-20191216070243-e5efeac4e302/go.mod h1:I9bWAt7QTg/que/qmUCJBGlj7wEq8OAFBjPNjc6xK4I=
+github.com/muesli/termenv v0.0.0-20200113033546-8f8d5d08dedf h1:l4WaujeZsr44fY6kYHlDlS1RlbW9Xz+edwW8LUqCYMw=
+github.com/muesli/termenv v0.0.0-20200113033546-8f8d5d08dedf/go.mod h1:QAW21ZWi5eDIAoYsevV52sibdVVCl44P+TvI0C0VKEU=
 github.com/nkovacs/streamquote v0.0.0-20170412213628-49af9bddb229/go.mod h1:0aYXnNPJ8l7uZxf45rWW1a/uME32OF0rhiYGNQ2oF2E=
 github.com/olekukonko/tablewriter v0.0.4 h1:vHD/YYe1Wolo78koG299f7V/VAS08c6IpCLn+Ejf/w8=
 github.com/olekukonko/tablewriter v0.0.4/go.mod h1:zq6QwlOf5SlnkVbMSr5EoBv3636FWnp+qbPhuoO21uA=

testdata/enumeration.test

@@ -1,3 +1,3 @@
                                                                                 
-1. First Item                                                                   
-2. Second Item                                                                  
+1. First Item                                                                   
+2. Second Item                                                                  

testdata/heading.test

@@ -1,3 +1,3 @@
-  => h1 <=                                                                      
-    ## h2                                                                       
-      ### h3
+  => h1 <=                                                                      
+    ## h2                                                                       
+      ### h3

testdata/image.test

@@ -1 +1 @@
-Image [Image: https://charm.sh/logo.png].                                       
+Image [Image: https://charm.sh/logo.png].                                       

testdata/issues/42.test

@@ -1,6 +1,6 @@
 
-  If you want to make a more significant change, please first open an issue     
-  https://github.com/twpayne/chezmoi/issues/new to discuss the change that you  
-  want to make. Dave Cheney gives a good rationale                              
-  https://dave.cheney.net/2019/02/18/talk-then-code as to why this is important.
+  If you want to make a more significant change, please first open an issue     
+  https://github.com/twpayne/chezmoi/issues/new to discuss the change that you  
+  want to make. Dave Cheney gives a good rationale                              
+  https://dave.cheney.net/2019/02/18/talk-then-code as to why this is important.
 

testdata/issues/43.test

@@ -1,10 +1,10 @@
 
                                                                                 
-  • Getting started                                                             
-  • Developing locally                                                          
-  • Documentation changes                                                       
-  • Contributing changes                                                        
-  • Managing releases                                                           
-  • Packaging                                                                   
-  • Updating the website                                                        
+  • Getting started                                                             
+  • Developing locally                                                          
+  • Documentation changes                                                       
+  • Contributing changes                                                        
+  • Managing releases                                                           
+  • Packaging                                                                   
+  • Updating the website                                                        
 

testdata/link.test

@@ -1 +1 @@
-This is a link (https://charm.sh).                                              
+This is a link (https://charm.sh).                                              

testdata/list.test

@@ -1,4 +1,4 @@
                                                                                 
-• First Item                                                                    
-    • Nested List Item                                                          
-• Second Item                                                                   
+• First Item                                                                    
+    • Nested List Item                                                          
+• Second Item                                                                   

testdata/readme.test

@@ -1,36 +1,36 @@
 
-   Gold                                                                         
+   Gold                                                                         
                                                                                 
-  Render markdown on the CLI, with pizzazz!                                     
+  Render markdown on the CLI, with pizzazz!                                     
                                                                                 
-  ## What is it?                                                                
+  ## What is it?                                                                
                                                                                 
   Gold is a Golang library that allows you to use JSON based stylesheets to     
   render Markdown files in the terminal. Just like CSS, you can define color and
   style attributes on Markdown elements. The difference is that you use ANSI    
   color and terminal codes instead of CSS properties and hex colors.            
                                                                                 
-  ## Usage                                                                      
+  ## Usage                                                                      
                                                                                 
-  See cmd/gold /cmd/gold/.                                                      
+  See cmd/gold /cmd/gold/.                                                      
                                                                                 
-  ## Example Output                                                             
+  ## Example Output                                                             
                                                                                 
   Image: Gold Dark Style →                                                      
-  https://github.com/charmbracelet/gold/raw/master/styles/gallery/dark.png      
+  https://github.com/charmbracelet/gold/raw/master/styles/gallery/dark.png      
                                                                                 
-  Check out the Gold Style Gallery                                              
-  https://github.com/charmbracelet/gold/blob/master/styles/gallery/README.md!   
+  Check out the Gold Style Gallery                                              
+  https://github.com/charmbracelet/gold/blob/master/styles/gallery/README.md!   
                                                                                 
-  ## Colors                                                                     
+  ## Colors                                                                     
                                                                                 
-  Currently  gold  uses the Aurora ANSI colors                                  
-  https://godoc.org/github.com/logrusorgru/aurora#Index.                        
+  Currently  gold  uses the Aurora ANSI colors                                  
+  https://godoc.org/github.com/logrusorgru/aurora#Index.                        
                                                                                 
-  ## Development                                                                
+  ## Development                                                                
                                                                                 
   Style definitions located in  styles/  can be embedded into the binary by     
-  running statik https://github.com/rakyll/statik:                              
+  running statik https://github.com/rakyll/statik:                              
                                                                                 
     statik -f -src styles -include "*.json"                                     
                                                                                 

testdata/task.test

@@ -1,3 +1,3 @@
                                                                                 
-✓ Finished Task                                                                 
-✗ Outstanding Task                                                              
+✓ Finished Task                                                                 
+✗ Outstanding Task